Enlarging digits array
[u/mrichter/AliRoot.git] / EMCAL / AliEMCALGeometry.cxx
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2012850d 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/* $Id$*/
17
18//_________________________________________________________________________
19// Geometry class for EMCAL : singleton
b13bbe81 20// EMCAL consists of layers of scintillator and lead
ffa6d63b 21// Places the the Barrel Geometry of The EMCAL at Midrapidity
22// between 0 and 120 degrees of Phi and
23// -0.7 to 0.7 in eta
24// Number of Modules and Layers may be controlled by
25// the name of the instance defined
b13bbe81 26//*-- Author: Sahal Yacoob (LBL / UCT)
27// and : Yves Schutz (SUBATECH)
28// and : Jennifer Klay (LBL)
2012850d 29
2012850d 30// --- AliRoot header files ---
ca8f5bd0 31#include <TMath.h>
116cbefd 32#include <TVector3.h>
173558f2 33
ca8f5bd0 34// -- ALICE Headers.
d64c959b 35//#include "AliConst.h"
173558f2 36
ca8f5bd0 37// --- EMCAL headers
38#include "AliEMCALGeometry.h"
2012850d 39
b13bbe81 40ClassImp(AliEMCALGeometry);
2012850d 41
b13bbe81 42AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
43Bool_t AliEMCALGeometry::fgInit = kFALSE;
2012850d 44
b13bbe81 45//______________________________________________________________________
46AliEMCALGeometry::~AliEMCALGeometry(void){
47 // dtor
2012850d 48}
b13bbe81 49
395c7ba2 50//______________________________________________________________________
09884213 51Bool_t AliEMCALGeometry::AreInSameTower(Int_t id1, Int_t id2) const {
fdebddeb 52 // Find out whether two hits are in the same tower
395c7ba2 53 Int_t idmax = TMath::Max(id1, id2) ;
54 Int_t idmin = TMath::Min(id1, id2) ;
55 if ( ((idmax - GetNZ() * GetNPhi()) == idmin ) ||
56 ((idmax - 2 * GetNZ() * GetNPhi()) == idmin ) )
57 return kTRUE ;
58 else
59 return kFALSE ;
60}
05a92d59 61
395c7ba2 62//______________________________________________________________________
63void AliEMCALGeometry::Init(void){
64 // Initializes the EMCAL parameters
fdebddeb 65 // naming convention : GUV_WX_N_ gives the composition of a tower
395c7ba2 66 // WX inform about the composition of the EM calorimeter section:
fdebddeb 67 // thickness in mm of Pb radiator (W) and of scintillator (X), and number of scintillator layers (N)
68 // New geometry: EMCAL_55_25
395c7ba2 69
fdebddeb 70 fgInit = kFALSE; // Assume failed until proven otherwise.
71 TString name(GetName()) ;
72 if (name == "EMCAL_55_25") {
73 fECPbRadThickness = 0.5; // cm, Thickness of the Pb radiators
74 fECScintThick = 0.5; // cm, Thickness of the scintillator
75 fNECLayers = 25; // number of scintillator layers
395c7ba2 76
fdebddeb 77 fSampling = 11.8;
395c7ba2 78
fdebddeb 79 fAlFrontThick = 3.5; // cm, Thickness of front Al layer
395c7ba2 80 fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
81 }
fdebddeb 82 else if( name == "G56_2_55_19" || name == "EMCAL_5655_21" || name == "G56_2_55_19_104_14"|| name == "G65_2_64_19" || name == "EMCAL_6564_21"){
83 Fatal("Init", "%s is an old geometry! Please update your Config file", name.Data()) ;
395c7ba2 84 }
85 else
86 Fatal("Init", "%s is an undefined geometry!", name.Data()) ;
05a92d59 87
395c7ba2 88 // geometry
fdebddeb 89 fNZ = 114; // granularity along Z (eta)
90 fNPhi = 168; // granularity in phi (azimuth)
91 fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
92 fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
93 fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
94 fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
395c7ba2 95
96 fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
fdebddeb 97
98 //There is always one more scintillator than radiator layer because of the first block of aluminium
99 fShellThickness = fAlFrontThick + fGap2Active + fNECLayers*GetECScintThick()+(fNECLayers-1)*GetECPbRadThick();
100
395c7ba2 101 fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax); // Z coverage
102 fEnvelop[0] = fIPDistance; // mother volume inner radius
103 fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
104 fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
105
106 fgInit = kTRUE;
107
88cb7938 108 if (gDebug) {
fdebddeb 109 printf("Init: geometry of EMCAL named %s is as follows:", name.Data());
88cb7938 110 printf( " ECAL : %d x (%f mm Pb, %f mm Sc) \n", GetNECLayers(), GetECPbRadThick(), GetECScintThick() ) ;
88cb7938 111 printf("Granularity: %d in eta and %d in phi\n", GetNZ(), GetNPhi()) ;
112 printf("Layout: phi = (%f, %f), eta = (%f, %f), y = %f\n",
113 GetArm1PhiMin(), GetArm1PhiMax(),GetArm1EtaMin(), GetArm1EtaMax(), GetIPDistance() ) ;
114 }
2012850d 115}
173558f2 116
b13bbe81 117//______________________________________________________________________
118AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
05a92d59 119 // Returns the pointer of the unique instance
120
121 return static_cast<AliEMCALGeometry *>( fgGeom ) ;
2012850d 122}
173558f2 123
b13bbe81 124//______________________________________________________________________
125AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
126 const Text_t* title){
127 // Returns the pointer of the unique instance
128
129 AliEMCALGeometry * rv = 0;
130 if ( fgGeom == 0 ) {
131 if ( strcmp(name,"") == 0 ) rv = 0;
132 else {
133 fgGeom = new AliEMCALGeometry(name, title);
134 if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
135 else {
136 rv = 0;
137 delete fgGeom;
138 fgGeom = 0;
139 } // end if fgInit
140 } // end if strcmp(name,"")
141 }else{
142 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
fdebddeb 143 printf("\ncurrent geometry is ") ;
144 printf(fgGeom->GetName());
145 printf("\n you cannot call ");
146 printf(name);
b13bbe81 147 }else{
9859bfc0 148 rv = (AliEMCALGeometry *) fgGeom;
b13bbe81 149 } // end if
150 } // end if fgGeom
151 return rv;
2012850d 152}
173558f2 153
ca8f5bd0 154//______________________________________________________________________
395c7ba2 155Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi) const {
156 // Returns the tower index number from the based on the Z and Phi
fdebddeb 157 // index numbers.
395c7ba2 158 // Inputs:
fdebddeb 159 // Int_t ieta // index along z axis [1-fNZ]
160 // Int_t iphi // index along phi axis [1-fNPhi]
395c7ba2 161 // Outputs:
162 // none.
163 // Returned
164 // Int_t index // Tower index number
165
166 if ( (ieta <= 0 || ieta>GetNEta()) ||
167 (iphi <= 0 || iphi>GetNPhi()))
168 Fatal("TowerIndex", "Unexpected parameters eta = %d phi = %d!", ieta, iphi) ;
169
170 return ( (iphi - 1)*GetNEta() + ieta );
ca8f5bd0 171}
173558f2 172
ca8f5bd0 173//______________________________________________________________________
fdebddeb 174void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi) const {
395c7ba2 175 // Inputs:
fdebddeb 176 // Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2 177 // Outputs:
178 // Int_t ieta // index allong z axis [1-fNZ]
179 // Int_t iphi // index allong phi axis [1-fNPhi]
395c7ba2 180 // Returned
181 // none.
395c7ba2 182
fdebddeb 183 Int_t nindex = 0;
395c7ba2 184
fdebddeb 185 if ( IsInECA(index) ) { // ECAL index
395c7ba2 186 nindex = index ;
395c7ba2 187 }
188 else
189 Fatal("TowerIndexes", "Unexpected Id number!") ;
190
191 if (nindex%GetNZ())
192 iphi = nindex / GetNZ() + 1 ;
193 else
194 iphi = nindex / GetNZ() ;
195 ieta = nindex - (iphi - 1) * GetNZ() ;
196
197 if (gDebug==2)
fdebddeb 198 printf("TowerIndexes: index=%d,%d, ieta=%d, iphi = %d", index, nindex,ieta, iphi) ;
395c7ba2 199 return;
200
ca8f5bd0 201}
173558f2 202
ca8f5bd0 203//______________________________________________________________________
a34b7b9f 204void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
ca8f5bd0 205 // given the tower index number it returns the based on the eta and phi
206 // of the tower.
207 // Inputs:
fdebddeb 208 // Int_t index // Tower index number [1-fNZ*fNPhi]
ca8f5bd0 209 // Outputs:
210 // Float_t eta // eta of center of tower in pseudorapidity
211 // Float_t phi // phi of center of tower in degrees
212 // Returned
213 // none.
fdebddeb 214 Int_t ieta, iphi;
395c7ba2 215 Float_t deta, dphi ;
ca8f5bd0 216
fdebddeb 217 TowerIndexes(index,ieta,iphi);
395c7ba2 218
219 if (gDebug == 2)
fdebddeb 220 printf("EtaPhiFromIndex: index = %d, ieta = %d, iphi = %d", index, ieta, iphi) ;
395c7ba2 221
222 deta = (GetArm1EtaMax()-GetArm1EtaMin())/(static_cast<Float_t>(GetNEta()));
223 eta = GetArm1EtaMin() + ((static_cast<Float_t>(ieta) - 0.5 ))*deta;
224
225 dphi = (GetArm1PhiMax() - GetArm1PhiMin())/(static_cast<Float_t>(GetNPhi())); // in degrees.
226 phi = GetArm1PhiMin() + dphi*(static_cast<Float_t>(iphi) - 0.5);//iphi range [1-fNphi].
ca8f5bd0 227}
173558f2 228
ca8f5bd0 229//______________________________________________________________________
a34b7b9f 230Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0 231 // returns the tower index number based on the eta and phi of the tower.
232 // Inputs:
233 // Float_t eta // eta of center of tower in pseudorapidity
234 // Float_t phi // phi of center of tower in degrees
235 // Outputs:
236 // none.
237 // Returned
238 // Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2 239
e908f07f 240 Int_t ieta,iphi;
ca8f5bd0 241
395c7ba2 242 ieta = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNEta()) * (eta - GetArm1EtaMin()) / (GetArm1EtaMax() - GetArm1EtaMin())) ) ;
243
244 if( ieta <= 0 || ieta > GetNEta() ) {
245 Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
246 return -1 ;
247 }
248
249 iphi = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNPhi()) * (phi - GetArm1PhiMin()) / (GetArm1PhiMax() - GetArm1PhiMin())) ) ;
250
251 if( iphi <= 0 || iphi > GetNPhi() ) {
252 Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
253 return -1 ;
254 }
255
256 return TowerIndex(ieta,iphi);
ca8f5bd0 257}
173558f2 258
ca8f5bd0 259//______________________________________________________________________
a34b7b9f 260Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
ca8f5bd0 261 // Converts the absolute numbering into the following array/
2608a1fc 262 // relid[0] = Row number inside EMCAL
263 // relid[1] = Column number inside EMCAL
ca8f5bd0 264 // Input:
265 // Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
266 // Outputs:
2608a1fc 267 // Int_t *relid // array of 2. Described above.
ca8f5bd0 268 Bool_t rv = kTRUE ;
fdebddeb 269 Int_t ieta=0,iphi=0,index=AbsId;
ca8f5bd0 270
fdebddeb 271 TowerIndexes(index,ieta,iphi);
2608a1fc 272 relid[0] = ieta;
273 relid[1] = iphi;
ca8f5bd0 274
275 return rv;
276}
173558f2 277
ca8f5bd0 278//______________________________________________________________________
395c7ba2 279void AliEMCALGeometry::PosInAlice(const Int_t *relid, Float_t &theta, Float_t &phi) const
280{
281 // Converts the relative numbering into the local EMCAL-module (x, z)
282 // coordinates
2608a1fc 283 Int_t ieta = relid[0]; // offset along x axis
284 Int_t iphi = relid[1]; // offset along z axis
395c7ba2 285 Int_t index;
286 Float_t eta;
287
288 index = TowerIndex(ieta,iphi);
289 EtaPhiFromIndex(index,eta,phi);
fdebddeb 290 //theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
291 theta = 2.0*TMath::ATan(TMath::Exp(-eta));
395c7ba2 292
fdebddeb 293 // correct for distance to IP
294 Float_t d = GetIP2ECASection() - GetIPDistance() ;
395c7ba2 295
296 Float_t correction = 1 + d/GetIPDistance() ;
297 Float_t tantheta = TMath::Tan(theta) * correction ;
298 theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
299 if (theta < 0 )
300 theta += 180. ;
301
302 return;
303}
ca8f5bd0 304
395c7ba2 305//______________________________________________________________________
09884213 306void AliEMCALGeometry::PosInAlice(Int_t absid, Float_t &theta, Float_t &phi) const
395c7ba2 307{
308 // Converts the relative numbering into the local EMCAL-module (x, z)
309 // coordinates
2608a1fc 310 Int_t relid[2] ;
395c7ba2 311 AbsToRelNumbering(absid, relid) ;
2608a1fc 312 Int_t ieta = relid[0]; // offset along x axis
313 Int_t iphi = relid[1]; // offset along z axis
395c7ba2 314 Int_t index;
315 Float_t eta;
316
317 index = TowerIndex(ieta,iphi);
318 EtaPhiFromIndex(index,eta,phi);
319 theta = 2.0*TMath::ATan(TMath::Exp(-eta)) ;
320
fdebddeb 321 // correct for distance to IP
395c7ba2 322 Float_t d = 0. ;
fdebddeb 323 if (IsInECA(absid))
88cb7938 324 d = GetIP2ECASection() - GetIPDistance() ;
395c7ba2 325 else
326 Fatal("PosInAlice", "Unexpected id # %d!", absid) ;
327
328 Float_t correction = 1 + d/GetIPDistance() ;
329 Float_t tantheta = TMath::Tan(theta) * correction ;
330 theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
331 if (theta < 0 )
332 theta += 180. ;
333
334 return;
ca8f5bd0 335}
6119e5db 336
337//______________________________________________________________________
338void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
339 // given the tower relative number it returns the X, Y and Z
340 // of the tower.
341
342 // Outputs:
343 // Float_t x // x of center of tower in cm
344 // Float_t y // y of center of tower in cm
345 // Float_t z // z of centre of tower in cm
346 // Returned
347 // none.
348
fdebddeb 349 Float_t eta,theta, phi,cylradius=0. ;
6119e5db 350
2608a1fc 351 Int_t ieta = relid[0]; // offset along x axis
352 Int_t iphi = relid[1]; // offset along z axis.
6119e5db 353 Int_t index;
354
395c7ba2 355 index = TowerIndex(ieta,iphi);
6119e5db 356 EtaPhiFromIndex(index,eta,phi);
357 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
6119e5db 358
fdebddeb 359 cylradius = GetIP2ECASection() ;
a97849a9 360
395c7ba2 361 Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb 362 x = cylradius * TMath::Cos(phi * kDeg2Rad ) ;
363 y = cylradius * TMath::Sin(phi * kDeg2Rad ) ;
364 z = cylradius / TMath::Tan(theta * kDeg2Rad ) ;
6119e5db 365
366 return;
367}
368
395c7ba2 369//______________________________________________________________________
09884213 370void AliEMCALGeometry::XYZFromIndex(Int_t absid, TVector3 &v) const {
395c7ba2 371 // given the tower relative number it returns the X, Y and Z
372 // of the tower.
373
374 // Outputs:
375 // Float_t x // x of center of tower in cm
376 // Float_t y // y of center of tower in cm
377 // Float_t z // z of centre of tower in cm
378 // Returned
379 // none.
380
fdebddeb 381 Float_t theta, phi,cylradius=0. ;
395c7ba2 382
383 PosInAlice(absid, theta, phi) ;
384
88cb7938 385 if ( IsInECA(absid) )
fdebddeb 386 cylradius = GetIP2ECASection() ;
395c7ba2 387 else
388 Fatal("XYZFromIndex", "Unexpected Tower section") ;
389
390 Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb 391 v.SetX(cylradius * TMath::Cos(phi * kDeg2Rad ) );
392 v.SetY(cylradius * TMath::Sin(phi * kDeg2Rad ) );
393 v.SetZ(cylradius / TMath::Tan(theta * kDeg2Rad ) ) ;
395c7ba2 394
395 return;
396}